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diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
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@@ -1,5 +1,28 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*  `#pluck` can be used on a relation with `select` clause
+   Fix #7551
+
+   Example:
+
+        Topic.select([:approved, :id]).order(:id).pluck(:id)
+
+   *Yves Senn*
+
+*   Do not create useless database transaction when building `has_one` association.
+
+    Example:
+
+        User.has_one :profile
+        User.new.build_profile
+
+    *Bogdan Gusiev*
+
+*   :counter_cache option for `has_many` associations to support custom named counter caches.
+    Fix #7993
+
+    *Yves Senn*
+
 *   Deprecate the possibility to pass a string as third argument of `add_index`.
     Pass `unique: true` instead.